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July 4 BluFax Demo Briefing
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July 4 BluFax Demo Briefing

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Breifing on use of BluFAX to collect traveltime data in DC on the 4th of July.

Breifing on use of BluFAX to collect traveltime data in DC on the 4th of July.


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  • 01/06/10 01/06/10 I might move this slide to after the “Everyone is Looking for the Answer Slide” Deployment of BluFAX requires a minimum of two units. Spacing of units depends on the specific application and the environment.
  • 4108753911
  • Transcript

    • 1. Demonstration of Bluetooth-based Traffic Monitoring Technology Demonstration Results 4 th of July Weekend 2009 Prepared for: District of Columbia Department of Transportation Donna C. Nelson, PhD Transportation Perspectives Inc [email_address] Stan Young, PhD Traffax Inc [email_address]
    • 2. Acknowledgements
      • Traffax, Inc
      This demonstration was conducted as a collaborative effort by:
      • Transportation Perspectives, Inc
      • District of Columbia Department of Transportation
      • University of Maryland
      Transportation Perspectives Inc [email_address]
    • 3. Presentation
      • Background/overview
      • Purpose and objectives of the test
      • Overview of Blu-FAX Technology (the basics)
      • Study Approach (what we did)
      • Presentation of Test Results
      • Lessons Learned
      • Applications of BluFAX for a wide-scale test
      • Additional applications of BluFAX
      Transportation Perspectives Inc [email_address]
    • 4. Background
      • The 4 th of July celebrations present a unique opportunity to collect data to test and refine traffic management strategies.
        • Evacuation routes and strategies
        • Signal timing and traffic management strategies
        • Special events planning and management.
      Transportation Perspectives Inc [email_address]
    • 5. Background
      • Do not provide sufficient data to support DDOT analysis and modeling needs.
      • Travel time runs (floating car techniques) yield limited data on congested roadways.
      • Cost of traditional data collection approaches is labor intensive and expensive.
      • Data collection efforts limited to 9:00PM to 12:00 AM on July 4.
      Transportation Perspectives Inc [email_address] Traditional Traffic Studies
    • 6. Background
      • Providing real-time freeway travel time data
      • Evaluation of Signal Timing Improvements along arterial roadways.
      • Monitoring pedestrian and vehicle traffic at Indianapolis Speedway (The Brick Yard) Events.
      • Estimating passenger delay at airport security check points
      BluFAX has performed well for a variety of applications that are similar to those needed to support Operation Fast Forward. Examples include: These studies suggest that BluFAX is suitable for use in the Capital Mall area, however the technology has not yet been tested in a dense, urban environment. Transportation Perspectives Inc [email_address]
    • 7. Demonstration Objectives
      • Use in dense urban environments
        • Extremely heavy pedestrian volumes
        • Pedestrian travel speeds that may be higher than vehicle speeds at times
        • Roadway environment and security considerations dictate available locations of data collection units.
      • Technology
        • Filtering approaches (BluStat Software) developed for freeway and/or higher-speed arterial roadways may require adjustment for application.
        • Addressing bi-modal distributions among pedestrian and vehicle traffic
        • Antenna footprint /or other factors related to detection rates.
      A demonstration on the 4 th of July is an opportunity to assess the capabilities and performance of BluFAX Transportation Perspectives Inc [email_address]
    • 8. Demonstration Objectives
      • Obtain Data set to support evaluation of BluFAX processes and performance
        • Detection rates and matched detections along study corridor.
        • Familiarization with BluFAX data processing features and capabilities.
        • Organization and format of BluStat output. .
      • Define and assess potential for BluFAX use
        • BluFAX capabilities and applications as part of comprehensive data collection efforts.
        • Potential use in a multi-corridor data collection effort on the 4th of July
        • Additional applications of interest to DDOT, that build on BluFAX capabilities.
        • Consider strategies/options for locating portable as well as permanently installed units.
      Transportation Perspectives Inc [email_address]
    • 9. BluFAX Technology Overview of capabilities and features Transportation Perspectives Inc [email_address]
    • 10. BluFax Technology 2 miles Traffax Equipment** * Bluetooth signals come from cell phones, PDAs, laptops, GPS, car radios… ** Provisional patent received Bluetooth Signal * Time = 8:03:26 AM Time = 8:05:58 AM Travel Time = 2:32 Minutes Speed = 51.7 MPH
      • How it works
      Transportation Perspectives Inc [email_address]
    • 11. Detection Zone A Bluetooth enabled device may be detected more than once as it passes through a detection zone. As traffic slows, the probability of getting multiple observation of the same MAC ID from a single device increases. BluFAX detects and records Mac addresses present within the detection zone. Size of detection zone depends on antenna strength, placement of units, and other factors related to the environment. Processing software configured to detect and address multiple detections. Transportation Perspectives Inc [email_address] A B L = Length of segment Detection Zones
    • 12. BluFAX Capabilities
      • Ability to collect data continuously over an extended period of time.
      • BluStat software processes raw data and delivers output in graphic and tablular formats (CSV and Excel).
      • Substantially lower labor costs associated with conducting travel time studies and manual turning movement counts.
      • Can be deployed to obtain information not available by other means:
        • Time-based origin-destination data for both pedestrians and vehicles.
        • Direct measures of travel time and delay along routes.
      • Technology minimizes concerns related to public privacy.
      Key features of BluFAX Additional information available at www. Traffaxinc.com Transportation Perspectives Inc [email_address]
    • 13. Demonstration Details 4 th of July Demonstration Transportation Perspectives Inc [email_address]
    • 14. Details-Study Area
      • 7 th and Indiana Ave
      • 7 th and F Street
      • 7 th and K Street
      • 7 th and S Street
      Four (4) BluFAX units were placed along the Georgia Avenue/7 th Street Corridor Units collected data continuously from approximately
      • 7PM, Thursday, July 2
      • 7AM, Sunday, July 5
      Transportation Perspectives Inc [email_address]
    • 15. Details-Placement of Sensors
      • Closest parking space to intersection was reserved by DDOT for study.
      • Portable units placed on floor of vehicle and covered.
      • Antenna affixed to window of vehicle using adhesive fasteners.
      • Location of antenna provided a clear view of intersection
      • Demo employed Class I antennae with a rated open air range of 100 m.
      • Detection during demo limited by line of site obstructions (buildings and other structures)
      Vehicles were placed on side streets, generally within 50 feet of the intersection of interest. Transportation Perspectives Inc [email_address]
    • 16. Sensor Locations Adjacent to 7 th Street Indiana Avenue, NW One-way traffic Metro Entrance Sensor Location F Street, NW
    • 17. Sensor Locations Adjacent to 7 th Street K Street S Street Sensor Location Sensor Location Transportation Perspectives Inc [email_address]
    • 18. Data Format and Processing Transportation Perspectives Inc [email_address]
    • 19. Data Collection & Processing
      • Station Processing
        • Invalid codes
        • Multiple detections combined
        • 5 minute detection rates
      • Segment Processing
        • Matched pairs
        • Filter outliers and data points
        • Calculate travel time, speed
        • Output 5, 15 minute, & 1 hour
      At the end of the study, raw data were downloaded and processed using BluSTAT software provided with the equipment.
      • Data Recorded
        • Device ID
        • Sensor location (GPS)
        • Time
        • Mac Address
      Station Processing Segment Processing Data Recorded Transportation Perspectives Inc [email_address]
    • 20. Station Analysis
      • Detections include all valid IDs recorded within the detection zone.
      • The software discards invalid MAC IDs.
      • Identifies and addresses multiple detections from the same ID
      • Multiple detections within a 4 minute threshold are treated as a single detection.
      • Detections that are separated by a larger time gap are treated as separate detections.
      Data stored on memory media from each unit are downloaded to a PC.
    • 21. Study Detection Rates 2 nd – 5 th July
      • 5 Minute Detection Rates
        • General patterns similar for all stations.
        • 5 Min. rates at Indiana Ave, F St, and K St range from 10 to 60 per 5 minute period between 9AM and 12AM.
        • Detections at S St much lower but could be due to differences in cross-street traffic and pedestrian traffic.
      • Detections
        • include all valid IDs recorded within the detection zone.
        • Invalid MAC IDs discarded.
        • Multiple detections from the same ID w/in 4 minute threshold treated as one detection
        • Detections > min apart treated as separate detections.
      Transportation Perspectives Inc [email_address]
    • 22. Study Detection Rates 2 nd – 5 th July Spike in traffic due to exodus from fireworks display is shown at all stations.
    • 23. Segment Processing
      • Segments are defined in the BluFAX Software
      • Detection records from two sensors are compared to identify “matched” pairs.
      • Direction of travel is determined based on the order in which IDs are recorded (based on segment definitions_
        • Station A to Station B
        • Station B to Station A
      • Sensors use GPS coordinates to determine straight-line distance between units, time references for sensor units are synchronized.
      • Once Station and Segment data are processed, segments can be defined as a “corridor”.
      Travel time and speed data are determined by matching detection records from two sensors. Transportation Perspectives Inc [email_address]
    • 24. 15 Minute/1 Hour Segment Reports
      • 15 minute and 1 hour summary reports
      • By travel direction and study date
      • Number of good data points on segment represents matched pairs, which also indicates sample size
      • Travel time summaries for section/time period.
      BluStat exports data in CSV and Excel formats based on filtered data. Excel Output Format for 15 minute and 1 hour summaries Summary Statistics for 15 minute periods Transportation Perspectives Inc [email_address]
    • 25. Travel Time Plots Travel Time - Minutes BluStat Output BluStat identifies “outliers”, which are not used to calculate travel time.
      • Classifications can be changed manually.
        • Select individual points
        • Minimum/maximum travel times
      Currently, criteria for identifying outliers are set for freeways/arterials Criteria for high-density environments likely to be different Transportation Perspectives Inc [email_address] 18 21 24 3 6 9 12 15 18 21 24 3 6 9 12 15 18 21 24 3 6 9 12 0 5 10 15 20 25 30 Travel Time Data Outliers Mean X
    • 26. Segment Processing Travel Time - Minutes These results have not been confirmed through statistical analysis!. BluFAX plots a mean travel time based on all data points. Once that line is removed, the data points appear to group into three categories based on travel times: 2 to 3 minutes 5 to 15 minutes > 15 minutes Transportation Perspectives Inc [email_address] 18 21 24 3 6 9 12 15 18 21 24 3 6 9 12 15 18 21 24 3 6 9 12 0 5 10 15 20 25 30
    • 27. Matching Pair and Sample Sizes
      • Traffic passing through study intersections on cross streets
      • Pedestrians entering metro at or between sensor locations.
      • Vehicles turning off or onto segment between sensors.
      Sample size is the number of matched pairs between two stations. The number of matches can be reduced by Intersections marked with blue circles are locations where 2008 data indicate points where vehicles could enter or exit route between sensors.
      • Sensors can be placed at intersections or mid-block.
      Transportation Perspectives Inc [email_address]
    • 28. Building on time/location data Sensors record the time and location a specific ID is identified. Segments can be defined between stations for different purposes. A series of segments can be defined as a corridor to estimate through that corridor, but depending on how links are defined, may not reflect travel times on a specific roadway segment. . Travel time data will be based on the shortest distance between the two stations that form a segment. Time and location matches can be used to provide O-D data and/or derive turning movements. Transportation Perspectives Inc [email_address]
    • 29. Summary
      • The BluFAX performed well for collection of travel time data along 7 th Street on the 4 th of July
        • Capable of collecting high-quality data over a period of several days. Units were checked during the study period, however no problems were encountered.
        • Placement and monitoring BluFAX units for the demonstration involved four field staff and a supervisor for approximately 10 hours total to place, monitor, and retrieve sensor units and to download data from sensor units. Time requirements per unit should be less for larger-scale studies.
        • The demonstration did not specifically address the use of BluFAX to collect pedestrian data, however, this capability could provide an added dimension to DDOTs ability to manage and monitor vehicle and pedestrian travel times.
      Transportation Perspectives Inc [email_address]
    • 30. Summary
      • BluStat software processes and packages data in graphic and tabular formats.
      • Tabular data is comparable with formats used for traditional traffic studies.
      • Data can be exported to CVS and Excel formats for further analysis.
      • It should be feasible to develop approaches to data analysis to address issues related to high pedestrian volumes and congested roadway conditions following special events.
      • Developing a study design that addresses vehicles turning off the study corridor at key routes between sensor units should increase.
        • Data from 2008 suggest that 22% of vehicles turn right onto New York Avenue alone. .
        • A thorough analysis of 2008 study data along the corridor may provide more robust estimates of how turning movements impact matched pairs on some roadway segments.
      Data Processing and Analysis Transportation Perspectives Inc [email_address]
    • 31. Study Design Considerations
      • The output provided by BluFAX is a sample and cannot provide traffic volumes or classification counts. Other studies indicate that sampling rate for specific locations remains somewhat constant over time.
      • Volume counts may be needed at some locations, to provide a basis for estimating volumes.
      • Placement of units in subsequent studies should allow demonstration of O-D capabilities.
      • A study design that builds on BluFAX capabilities may be able to fully or partially replace manual turning movement counts.
      Study Design Considerations Transportation Perspectives Inc [email_address]
    • 32. Summary
      • Location in vehicles worked well for this study, but is not appropriate for all situations (such as along Constitution Avenue)
      • Sensors locations
        • Advance lead time is needed to identify candidate locations
        • Units may be placed in vehicles or secured to the infrastructure
        • Mounting brackets needed to allow portable units to be mounted above ground level, to poles or elevated structures.
      • DDOT should consider permanent installations at some locations that support on-going use for a range of applications, supplemented by portable units for short-term, special studies.
      Securing Units Transportation Perspectives Inc [email_address]
    • 33. For Information
      • Donna Nelson, PhD.
        • [email_address]
        • www.t-perspectives.com
      • Stan Young, PhD
        • [email_address]
        • www.traffaxinc.com
      Transportation Perspectives Inc [email_address]